iEngineer vs Engineering Cookbook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iEngineer
Access a vast database of screw and bolt information, including dimensions, material grades, and strength properties for both US and metric fasteners. Features a comprehensive drill chart, unit conversion, and customizable material displays.
- Extensive US screw database
- Metric screw database (in-app purchase)
- Detailed dimensions and material grades
- Strength, torque, and clamp force data
- Head markings and 3D head models
- Comprehensive drill chart
- Unit conversion and data export
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iEngineer is the most comprehensive database of screw/bolt information that you can find anywhere. US screws: -93 different screws from #0 to 4” -Dimensions for 9 standard head styles -74 material grades including SAE, ASTM, and other materials Metric Screws (available as in-app purchase): -210 different metric screws from M1.0 to M100 -Dimensions for 10 standard head styles for ISO, DIN, BS, and ANSI standards where available -86 material grades including 12 additional metric grades, SAE, ASTM, and other materials Displayed values for both the US and Metric screws include: -Standard dimensions -Tap sizes -Clearance hole sizes -Material strength -Recommended torque values -Clamp force -Shear force -Head markings display -3D model of head type -Standard dimensions of head type Other features: -Drill chart with 523 drill bit sizes -Fraction chart -Copy and paste data values -Fast and easy unit conversion -Ability to show/hide material grades in the interface so you only see what is relevant to you If you have any questions please contact us at support@perfectlysimpleapps.com
Engineering Cookbook
A handy reference guide for mechanical designers, offering quick access to essential information on fan basics, system and duct design, motors, heating, refrigeration, and conversion factors.
- Fan Basics
- System Design
- Duct Design
- Motors & Drives
- Heating & Refrigeration
- Formulas & Conversion Factors
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The Engineering Cookbook is a convenient reference guide for mechanical designers. It provides "fingertip" access to frequently needed information, including: • Fan Basics • System Design • Duct Design • Motors & Drives • Heating & Refrigeration • Formulas & Conversion Factors
Screenshots
Verdict
The clearest difference is in-app purchases: Engineering Cookbook at none against iEngineer's 1. Engineering Cookbook also leads on iOS requirement (13.0 vs 26.0). iEngineer's advantage is update cadence (every 5 months vs every 34 months) and ratings volume (200 vs 6). On price, rating, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. iEngineer sells 1 one-off in-app purchase. Engineering Cookbook asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.6 for iEngineer against 4.5 for Engineering Cookbook. That said, the two scores are not equally well evidenced: iEngineer has 200 ratings behind it against 6, so its average is the more settled of the two. Written reviews are what separate them: 86% of iEngineer's written reviews are positive against 73% of Engineering Cookbook's.
iEngineer ships an update every 5 months, Engineering Cookbook every 34 months. The most recent releases landed on October 29, 2026 and October 23, 2026 respectively.
| Parameter | iEngineer | Engineering Cookbook |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (200 ratings) — better | 4.5 (6 ratings) |
| Positive reviews | 85.5% of reviews — better | 72.7% of reviews |
| Number of ratings | 200 — better | 6 |
| Update frequency | Every 5 months — better | Every 34 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Perfectly Simple Apps LLC | Loren Cook Company |
Customer experience
iEngineer
Engineering Cookbook
Bugs and requests
iEngineer
Reported bugs
2 issues- Metric portion not working for some users
- Camera access request for no apparent reason
Requested features
4 requests- Add tap drill chart
- Include clearance hole fits
- Improve UI for larger displays
- Add French language support
Engineering Cookbook
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iEngineer
- Metric Screws$1.99
Engineering Cookbook
No in-app purchases
